powercap: intel_rapl: Optimize rp->domains memory allocation

In the memory allocation of rp->domains in rapl_detect_domains(), there
is an additional memory of struct rapl_domain allocated, optimize the
code here to save sizeof(struct rapl_domain) bytes of memory.

Test in Intel NUC (i5-1135G7).

Signed-off-by: xiongxin <xiongxin@kylinos.cn>
Tested-by: xiongxin <xiongxin@kylinos.cn>
Reviewed-by: Srinivas Pandruvada<srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: TGSP

drivers/powercap/intel_rapl_common.c

@@ -1485,7 +1485,7 @@ static int rapl_detect_domains(struct rapl_package *rp)
 	}
 	pr_debug("found %d domains on %s\n", rp->nr_domains, rp->name);
 
-	rp->domains = kcalloc(rp->nr_domains + 1, sizeof(struct rapl_domain),
+	rp->domains = kcalloc(rp->nr_domains, sizeof(struct rapl_domain),
 			      GFP_KERNEL);
 	if (!rp->domains)
 		return -ENOMEM;